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Your main goal should be grinding for legendaries and/or sets (usually luck based) in order to boost your damage and defense but there are some tricks you can do gain a good boost in dmg/toughness that aren't too luck based.
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If you keep doing what you're doing right now, you're on the right path. Tl dr: how do I give myself a better chance of ensuring my gear levels with me in the end-game? Should I be looking to craft a new version of a set item to replace it? And if so, what aspects of the game will determine that the newly crafted version will be better than my current version? Is it purely random? With regard to set items, gear that I have at Torment I is not going to suffice if I try to step up to Torment IV. Is the quality of gear that drops related to the Torment level I'm playing at? Is it, along with probability/randomness, going to be some function of the level of my current equipped gear, or my paragon level? I suppose mostly I'm wondering about the better gear drops. Obviously the buffs provided by paragon points help to an extent, as does the cube powers, and finding and equipping better gear. I tend to do bounties and rifts and I up my paragon levels and slowly I seem to be able to cope better at my current torment level so I go to the next one, but I don't really understand specifically what it is I'm doing that is making the current level easier. I'm wondering what are the mechanics involved in being able to handle higher difficulty levels once you have a character at level 70.
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